Blood rain just before Halloween? While it may sound like a festive prank, forecasters are really predicting this bizarre weather occurrence.

The phenomenon is actually a mix of red dust from the Sahara Desert blowing toward Europe. However, because it’s supposed to rain, the dust will most likely mix with the precipitation causing red raindrops, or blood rain.

Other predictions include the blood rain spattering and staining cars to mixing with snow to create a gruesome winter wonderland.

“The warm air has been drawn from a long way south down in north Africa and is spreading north,” London’s Met Office forecaster Emma Sharples told news.com.au. “But there is going to be a sharp contrast in weather as a cold snap sweeps across the country from Friday, which is likely to bring snow to Scotland and the north of England.”

This isn’t the first time the U.K. has experienced blood rain. Throughout history it has been noted, and in earlier times was used to presage unfortunate events. In fact, as early as 685 the Anglo-Saxon Chronicle recorded “there was a bloody rain in Britain. And milk and butter were turned to blood. And Lothere, king of Kent, died.”

Let’s hope this year’s blood rain is nothing more than an uncanny incidence.